JP5170823B2 - Flush toilet - Google Patents

Description

  The present invention relates to a flush toilet, and more particularly to a flush toilet that is washed with pressurized flush water.

  Japanese Patent No. 2874207 (Patent Document 1) describes a toilet flushing water supply apparatus. In this cleaning water supply apparatus, a pressure sensor or a flow rate sensor is provided in the water supply path to the rim water discharge port, and the water discharge time for the cleaning water is set based on the detection value of the sensor. That is, it is possible to supply an appropriate amount of washing water by extending the water discharge time in an area where the tap water pressure is low and shortening the water discharge time in an area where the tap water pressure is high.

Japanese Patent No. 2874207

  However, in the toilet flushing water supply device described in Japanese Patent No. 2874207, the water discharge time is simply changed according to the tap water pressure, so that the toilet bowl can be sufficiently washed in an area where the tap water pressure is very low. There is a problem that you can not. That is, the problem is that the water discharged from the jet spout can not induce siphon phenomenon in the drain trap pipe even if a small amount of water is discharged for a long time, and the filth in the bowl part cannot be discharged sufficiently. There is.

  In addition, direct water pressure flush toilets are generally configured so that the wash water is discharged through a constant flow valve so that the flow rate of the wash water does not become excessive even in areas where the tap water pressure is high. ing. However, since the flow rate set by the constant flow valve varies greatly depending on individual differences, even when a constant flow valve with the smallest flow rate is used among these variations, the amount of discharged wash water is not insufficient. As shown, the water discharge time is set. For this reason, when a constant flow valve with a large flow rate is used among variations, there is a problem that the amount of washing water becomes excessive.

Accordingly, an object of the present invention is to provide a flush toilet that can supply an appropriate amount of washing water and can be installed in an area where the tap water pressure is low.
Another object of the present invention is to provide a flush toilet that can always supply an appropriate amount of flush water even when there are large individual differences in the constant flow valves used.

In order to solve the above-described problems, the present invention is a flush toilet that is washed with pressurized wash water, and includes a bowl portion in which a rim spout and a jet spout are formed, and a drain trap conduit. The flush toilet body, the pressurizing pump that pressurizes the wash water discharged from the jet spout, the storage tank that stores the wash water to be pressurized by the pressurization pump, and the rim discharge of the wash water by the water supply pressure Cleaning control means for cleaning the bowl portion by executing rim cleaning discharged from the water outlet and jet cleaning in which the cleaning water in the water storage tank is discharged from the jet water outlet by a pressure pump, and cleaning water discharged from the rim water outlet A flow rate measuring means for measuring the flow rate of the cleaning water discharged from the rim spout during the rim cleaning, and the flow rate measuring means. And a water discharge amount adjusting means for adjusting the water discharge time of the rim cleaning performed by the cleaning control means and the water discharge amount of the jet cleaning based on the measured flow rate, and the water discharge amount adjusting means is the number of rotations of the pressurizing pump. By changing the water discharge amount of the jet cleaning, the jet cleaning is a siphon activation region in which the siphon action is activated, a siphon duration area in which the flow rate is smaller than the siphon activation area and the activated siphon action is sustained, and After the siphon action is completed, the blow area is configured to push out filth in the drain trap pipe. In this blow area, the cleaning control means operates the pressure pump at a rotation speed substantially equal to the siphon activation area .

In the present invention configured as above, the cleaning control means discharges the cleaning water from the rim spout by the water supply pressure, and executes the rim cleaning. Further, the cleaning control means causes the cleaning water stored in the water storage tank to be discharged from the jet water outlet by the pressurizing pump, and performs the jet cleaning. On the other hand, the flow rate measurement means provided in the rim water discharge water supply path measures the flow rate from the rim water discharge port during rim cleaning. The water discharge amount adjusting means adjusts the water discharge time of the rim cleaning and the water discharge amount of the jet cleaning executed by the cleaning control means based on the flow rate measured by the flow rate measuring means. The water discharge amount adjusting means adjusts the water discharge amount of the jet cleaning by changing the rotation speed of the pressurizing pump. In addition, the jet cleaning is a siphon activation area that activates the siphon action, a siphon duration area that has a lower flow rate than the siphon activation area and maintains the activated siphon action, and after the siphon action ends, the filth in the drain trap pipe is removed. It consists of the blow area | region to push out, and in this blow area | region, a washing | cleaning control means operates a pressurization pump with the rotation speed substantially equal to a siphon starting area | region.

According to the present invention configured as described above, since the washing water discharged from the jet water outlet is pressurized by the pressurizing pump, sufficient toilet cleaning can be performed even in an area where the water supply pressure is low. . Further, since the water discharge time for rim cleaning and the water discharge amount for jet cleaning are adjusted by the water discharge amount adjusting means, an appropriate amount of cleaning water can be supplied. Moreover, adjustment of the amount of water discharge of jet washing can be performed by changing the rotation speed of a pressurizing pump, and appropriate toilet flushing can be set. Furthermore, the siphon action activated in the siphon activation area can be maintained while saving washing water in the siphon sustaining area, and the floating dirt and the like can be reliably discharged in the blow area.

  In the present invention, preferably, the rim cleaning includes pre-rim cleaning that is started before the start of jet cleaning and post-rim cleaning that is performed after the end of jet cleaning. Measure the flow rate.

  According to the present invention configured as described above, since the flow rate measuring unit measures the flow rate in the front rim cleaning, the measured flow rate can be reflected in the jet cleaning and the rear rim cleaning immediately after the measurement.

In the present invention, preferably, the water discharge amount adjusting means adjusts the water discharge amount of the jet cleaning by changing the time for operating the pressure pump.
According to the present invention configured as described above, it is possible to set the appropriate toilet flushing by changing the jet water discharge amount by changing the jet washing time.

In the present invention, preferably, the water discharge amount adjusting means adjusts the jet water discharge amount by changing the time of the blow region.
According to the present invention configured as described above, filth can be reliably pushed out from the drain trap pipe even in the cleaning mode in which generation of a strong siphon action cannot be expected.

In the present invention, preferably, the water discharge amount adjusting means adjusts the water discharge amount for jet cleaning and the water discharge time for the rear rim cleaning that are started immediately after the flow rate of the cleaning water measured during the front rim cleaning. .
According to the present invention configured as described above, appropriate toilet flushing can be performed even when the water supply pressure is temporarily greatly reduced, such as when water is discharged from another device.

  In the present invention, preferably, the water discharge amount adjusting means adjusts the water discharge time for the rim cleaning and the water discharge amount for the jet cleaning in the next bowl portion cleaning based on the flow rate measured by the flow rate measuring means.

  According to the present invention configured as described above, the water supply pressure in the area where the flush toilet is installed, the appropriate amount of flush water according to the individual difference of the constant flow valve used, etc., can be stably Can be supplied. Moreover, when the amount of water discharged in the next cleaning is adjusted based on the past plural times of flow rates measured by the flow rate measuring means, the accuracy of adjustment can be improved.

  In the present invention, preferably, the cleaning control means is configured to perform rim cleaning over a water discharge time adjusted based on a flow rate of rim water discharged at the time of previous toilet cleaning, and the latest toilet cleaning If the flow rate of the rim water discharged in step 1 is less than the flow rate of the previous rim water discharge, the water tank is returned to the specified water storage volume, then additional water discharge is performed to raise the water level in the bowl. Let

  According to the present invention configured as described above, since the cleaning control means performs additional water discharge to raise the water level in the bowl portion, the rim water discharge flow rate in the latest toilet flushing is more than the rim water discharge flow rate in the previous toilet flushing Even in the case where the water level is significantly reduced, it is possible to prevent the drain trap pipe from being closed.

  In the present invention, preferably, the amount of the cleaning water supplied to the bowl portion by the additional water discharge is such that the drain trap pipe is sealed based on the latest rim water discharge flow rate and the latest rim cleaning water discharge time. Thus, it is determined by the cleaning control means.

  According to the present invention configured as described above, the amount of additional water discharge is determined based on the latest flow rate of the rim water discharge and the water discharge time for rim cleaning, so that the drain trap pipe can be reliably sealed. In addition, it is possible to prevent generation of wasted water due to an excessive amount of additional water discharge.

In the present invention, the flow rate measuring means is preferably a pressure sensor.
According to the present invention configured as described above, since the flow rate is measured by the pressure sensor, the pressure loss in the portion where the flow rate measuring means in the water supply path is arranged can be kept low, and effective rim water discharge is performed. be able to.

According to the flush toilet of the present invention, it is possible to supply an appropriate amount of wash water and install it in an area where the tap water pressure is low.
Moreover, according to the flush toilet of the present invention, an appropriate amount of flush water can always be supplied even when the individual difference of the constant flow valves used is large.

Next, a flush toilet according to an embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a perspective view of the flush toilet according to the present embodiment as viewed from the upper right rear side. FIG. 2 is a block diagram showing a water supply system for rim water discharge and jet water discharge. Moreover, FIG. 3 is a graph which shows the timing which each part act | operates at the time of washing | cleaning of the flush toilet. FIG. 4 is a flowchart showing a procedure for adjusting the water discharge amount.

  As shown in FIG. 1, the flush toilet 1 by 1st Embodiment of this invention has the flush toilet main body 2 and the function part 10 arrange | positioned back. The functional unit 10 is covered with a side panel (FIG. 1 shows a state in which the side panel is removed).

  As shown in FIGS. 1 and 2, the flush toilet body 2 is made of earthenware, and includes a bowl portion 12 that receives filth, a drain trap pipe 14 that extends from the bottom of the bowl portion 12, and a jet spout that performs jet spouting. A water inlet 16 and a rim water outlet 18 for performing rim water discharge are formed. The drain trap pipe 14 extends rearward and obliquely upward from the bottom of the bowl portion 12, and then extends downward to be connected to the drain pipe D. The jet spout 16 is formed at the bottom of the bowl portion 12 and is configured to discharge cleaning water toward the inlet of the drain trap conduit 14. The rim water spouting port 18 is formed at the upper left rear of the bowl portion 12 and is configured to discharge cleaning water along the edge of the bowl portion 12.

  The flush toilet 1 according to the present embodiment is directly connected to a water supply that supplies cleaning water, and the cleaning water is discharged from the rim spout 18 by the water supply pressure of the water supply. In addition, the jet water spouting is configured such that the washing water stored in the water storage tank built in the function unit 10 is pressurized by a pressure pump and discharged from the jet water spouting port 16 at a large flow rate.

Next, the configuration of the functional unit 10 will be described with reference to FIGS. 1 and 2.
The function unit 10 includes a constant flow valve 20, a solenoid valve 22, a switching valve 28, a rim water discharge vacuum breaker 24, and a rim water discharge flapper valve 26 as a water supply system for rim water discharge. Further, a sensor 30 that is a flow rate measuring unit is disposed in a rim side water supply path 18 a that is a water supply path for the cleaning water between the rim water discharge flapper valve 26 and the rim water discharge port 18. Further, the functional unit 10 incorporates a water storage tank 32, a pressurizing pump 34, a jet water discharge vacuum breaker 36, and a jet water discharge flapper valve 38 as a water supply system for jet water discharge. Further, the function unit 10 incorporates a controller 40 that is a cleaning control means for controlling the electromagnetic valve 22, the switching valve 28, and the pressurizing pump 34.

  The constant flow valve 20 is configured to restrict the wash water flowing in through the stop cock 42a, the branch fitting 42b, and the strainer 42c to a predetermined flow rate or less. In the present embodiment, a constant flow valve 20 is used that restricts the flow rate of washing water to a nominal value of 12 liters / minute, but this flow rate is actually due to individual differences of the constant flow valve 20. , Varying between about 10-15 liters / minute.

  Further, the wash water that has passed through the constant flow valve 20 is connected so as to flow into the switching valve 28 via the electromagnetic valve 22. The electromagnetic valve 22 is opened and closed by a control signal from the controller 40, and is configured to cause the washing water to flow into the switching valve 28 or to stop. The switching valve 28 is disposed so as to distribute the wash water that has passed through the electromagnetic valve 22 to the water storage tank 32 side and the rim water spouting port 18 side by the control signal of the controller 40. The switching valve 28 is configured so that the wash water can be distributed to both the water storage tank 32 and the rim water spouting port 18 at an arbitrary ratio by setting.

  The rim water discharge vacuum breaker 24 is disposed in the middle of the rim-side water supply path 18 a that guides the wash water that has passed through the switching valve 28 to the rim water discharge port 18, and prevents backflow from the rim water discharge port 18 of the wash water.

  The rim water spouting flapper valve 26 is disposed in the rim-side water supply passage 18 a downstream of the rim water spouting vacuum breaker 24, and prevents backflow from the rim water spouting port 18 of the cleaning water. In the present embodiment, the rim water discharge vacuum breaker 24 and the rim water discharge flapper valve 26 are arranged in series in the rim side water supply path 18a, thereby preventing the backflow of the washing water more reliably.

  The sensor 30 is disposed in the rim side water supply path 18a between the rim water spouting flapper valve 26 and the rim water spouting port 18, and measures the flow rate of the cleaning water discharged from the rim water spouting port 18 during the rim cleaning. It is configured. In the present embodiment, a semiconductor pressure sensor that can reduce the pressure loss at the portion where the sensor in the water supply path is disposed is used as the sensor 30. Note that any sensor capable of grasping the flow rate of the cleaning water from the rim water spouting port 18 such as an impeller flow rate sensor, in addition to the pressure sensor other than the semiconductor pressure sensor, can be used as the sensor 30. In the present embodiment, the sensor 30 is disposed between the rim water spouting flapper valve 26 and the rim water spouting port 18, but the sensor 30 is disposed at an arbitrary position from the constant flow valve 20 to the rim water spouting port 18. can do. Preferably, by arranging the sensor 30 in the vicinity of the rim water spouting port 18, it is possible to reliably grasp the rim water spouting flow rate.

  The water storage tank 32 is configured to store cleaning water to be discharged from the jet water discharge port 16. In this embodiment, as shown in FIG. 1, the water storage tank 32 is disposed so as to extend from the rear right side of the flush toilet main body 2 to the upper part of the drain trap pipe 14 at the center of the rear of the flush toilet main body 2. And has an internal volume of about 3.5 liters. A resin mounting frame 2a, which is a mounting portion, is fixed to the rear of the flush toilet main body 2. The mounting frame 2a is configured separately from the flush toilet main body 2, and includes a water storage tank 32. It is formed in a substantially rectangular shape so as to surround the periphery of. The water storage tank 32 is suspended from the mounting frame 2a by engaging the flange portion at the upper end with the mounting frame 2a.

  Furthermore, in the present embodiment, the tip of the tank water supply path 32 a connected to the switching valve 28 is arranged so that an air gap is formed with respect to the water storage tank 32, and the reverse flow of the cleaning water in the water storage tank 32 Is preventing. Further, an upper end float switch 32b and a lower end float switch 32c are arranged inside the water storage tank 32, and are configured to detect the water level in the water storage tank 32.

The upper end float switch 32b is turned on when the water level of the water storage tank 32 reaches a predetermined water storage level, and the controller 40 is configured to detect this and close the electromagnetic valve 22.
The lower end float switch 32c is disposed in the vicinity of the bottom surface of the water storage tank 32. When the water level in the water storage tank 32 falls below the lower end float switch 32c, the lower end float switch 32c is turned on so that the water storage tank 32 can be detected empty. It is configured.

  The pressurizing pump 34 is configured to pressurize the wash water stored in the water storage tank 32 and discharge the pressurized water from the jet water outlet 16. In the present embodiment, the pressurizing pump 34 is disposed below the water storage tank 32. Further, two U-shaped metal plates 32d extending downward are attached to the bottom surface of the water storage tank 32, and the pressurizing pump 34 is suspended below the water storage tank 32 by these metal plates 32d. .

  The pressurizing pump 34 incorporates an impeller that pressurizes the cleaning water and a motor (not shown above) that drives the impeller. A water receiving tray 2b is disposed below the pressurizing pump 34, and is configured to receive condensed water droplets and water leakage. In the present embodiment, the pressurizing pump 34 is configured to pressurize the cleaning water in the water storage tank 32 and discharge the cleaning water from the jet water outlet 16 at a maximum flow rate of about 100 liters / minute. Yes.

The jet water spouting vacuum breaker 36 is connected to the downstream side of the pressurizing pump 34 to prevent the water stored in the bowl portion 12 from flowing back to the water storage tank 32 side, and to perform edge cutting between them. It is configured. Thereby, the stored water level in the water storage tank 32 can be set higher than the stored water level in the bowl portion 12. Further, the cleaning water that has passed through the jet water spouting vacuum breaker 36 is configured to be discharged from the jet water spouting port 16 through the jet side water supply passage 16a.
The jet water spouting flapper valve 38 is connected between the water storage tank 32 and the pressurizing pump 34, and prevents the backflow of the cleaning water in the pressurizing pump 34 to the water storage tank 32.

  The controller 40, which is a cleaning control means, sequentially operates the electromagnetic valve 22, the switching valve 28, and the pressurizing pump 34 by the operation of the toilet cleaning switch (not shown) by the user, and the rim water spouting port 18 and the jet water spouting port 16 are operated. The bowl portion 12 is washed by sequentially starting the water discharge from the. Furthermore, after the jet water discharge is completed, the controller 40 switches the switching valve 28 to replenish the water storage tank 32 with cleaning water, and when the float switch 32b detects a prescribed water storage amount, the controller 40 closes the electromagnetic valve 22 and stops water supply. It is configured as follows.

  Further, the controller 40 adjusts the water discharge time of the wash water from the rim water discharge port 18 and the water discharge amount of the wash water from the jet water discharge port 16 based on the flow rate of the rim water discharge measured by the sensor 30. 40a is built-in. Specifically, the controller 40 includes a CPU, a memory, and a program that operates them.

Next, with reference to FIG.3 and FIG.4, the effect | action of the flush toilet 1 by this embodiment is demonstrated.
First, when a toilet flushing switch (not shown) is operated in the standby state, the first rim water discharge is started. That is, when the user operates a toilet flushing switch (not shown) at time t1 in FIG. 3, the controller 40 sends a signal to the switching valve 28 to temporarily switch the switching valve 28 that has been switched to the rim water discharge side. Switch to the tank side. Next, the controller 40 sends a signal to the electromagnetic valve 22 to open it at time t2, and causes the cleaning water to flow into the switching valve 28. Accordingly, the wash water is discharged through the tank water supply path 32a until the flow of the wash water via the constant flow valve 20 and the electromagnetic valve 22 in the water supply path on the upstream side of the switching valve 28 is stabilized. In addition, air that has partially accumulated in the pipe 19 is discharged through the tank water supply path 32a. As described above, since the washing water with an unstable initial flow when the electromagnetic valve 22 is opened is not discharged from the rim water spouting port 18, the water discharged from the rim water spouting port 18 can be stabilized and the pipe 19 can be stabilized. The accumulated air can also be discharged, and the generation of unpleasant air discharge noise that occurs when the air in the pipe 19 is discharged through the rim spout 18 can be prevented.

  Next, the controller 40 sends a signal to the switching valve 28 at time t3, and gradually switches the switching valve 28 once switched to the tank side to the rim water discharge side (between times t3 and t4). As a result, the air introduced and accumulated by the rim water discharge vacuum breaker in the rim side water supply passage 18a upstream from the switching valve 28 is discharged from the rim water discharge port 18 by the water supply water pressure, and the wash water is subsequently discharged. Will come to be. Thereby, generation | occurrence | production of the discharge sound of the unpleasant air which generate | occur | produces when the air in the rim side water supply path 18a is discharged | emitted through the rim water discharge port 18 can be prevented. The wash water supplied from the water supply flows into the constant flow valve 20 through the stop cock 42a, the branch fitting 42b, and the strainer 42c, and the flow of the wash water is limited to a predetermined flow rate through the constant flow valve 20. . The wash water that has passed through the constant flow valve 20 is discharged from the rim spout 18 through the electromagnetic valve 22, the switching valve 28, the rim spout vacuum breaker 24, the rim spout flapper valve 26, and the sensor 30. At this time, the flow rate of the cleaning water discharged from the rim water spouting port 18 is measured by the sensor 30. The washing water discharged from the rim water spouting port 18 flows downward while turning in the bowl portion 12, and the inner wall surface of the bowl portion 12 is washed.

  Jet water spouting is started at time t5 after a predetermined time has elapsed. That is, the controller 40 sends a signal to the pressurization pump 34 at time t5 to activate it. In addition, the time t5 which starts jet water discharge is adjusted by the water discharge amount adjustment means 40a built in the controller 40 so that it may mention later. Further, as shown in FIG. 3, in the present embodiment, the electromagnetic valve 22 is opened even during jet water spouting, and the switching valve 28 remains switched to the rim water spouting side. Water discharge from the water discharge port 18 is also continued. When the pressurization pump 34 is activated, the wash water stored in the water storage tank 32 is pressurized. The washing water pressurized by the pressure pump 34 is discharged from the jet water outlet 16 opened at the bottom of the bowl portion 12 through the jet-side water supply passage 16a.

  More specifically, the rotational speed of the pressurizing pump 34 started at time t5 is increased to 1000 rpm by time t6, and this rotational speed is maintained until time t7. In this way, by suppressing the rotation speed immediately after the start of the pressurizing pump 134 to a relatively low rotation, the air accumulated in the vicinity of the top portion 44 of the washing water conduit 34a is rapidly discharged from the jet spout 16 and is uncomfortable. It is possible to prevent the generation of air exhaust noise.

  Next, the controller 40 increases the rotational speed of the pressurizing pump 34 at time t7, and the rotational speed is increased to 3500 rpm by time t8. This rotational speed is maintained from time t8, which is the siphon activation area, to time t9. By increasing the rotation speed of the pressurizing pump 34, the cleaning water in the water storage tank 32 is discharged from the jet water outlet 16 at a large flow rate. As a result, the inside of the drain trap pipe 14 is rapidly filled, and the siphon action is rapidly activated.

  Furthermore, the controller 40 reduces the rotation speed of the pressurizing pump 34 at time t9, and the rotation speed is decreased to 2600 rpm. This rotational speed is maintained for a predetermined time from time t9 which is the siphon sustaining region. Thus, by reducing the rotation speed of the pressure pump 34, the flow rate discharged from the jet water spouting port 16 is also reduced. However, since the flow rate discharged from the jet spout 16 in the siphon sustaining region is a flow rate sufficient to sustain the siphoning action generated in the siphon activation region, the siphoning effect is substantially maintained until the end of the siphoning sustaining region. Is done. In this way, by maintaining the siphon action while reducing the flow rate in the siphon sustaining region, the siphon action can be maintained for a long time while suppressing the amount of cleaning water discharged from the jet spout 16.

  By the end of the siphon sustaining region, the accumulated water in the bowl portion 12 is almost completely discharged, so the flow rate of the cleaning water flowing into the drain trap pipe 14 is reduced, and the siphon action ends. The controller 40 then increases the rotation speed of the pressure pump 34 again, and the rotation speed is increased to 3500 rpm at time t10. This rotational speed is maintained from time t10 to time t11 in the blow region.

  Here, the flow rate of the cleaning water discharged from the jet spout 16 in the blow region is the same as that in the siphon activation region, but in the blow region, there is almost no remaining water in the bowl portion 12, so the drain trap The flow rate of the wash water flowing into the pipeline 14 is relatively small and the siphon action is not activated again. In this blow region, the filth remaining in the bowl portion 12 and the drain trap pipe 14 is pushed out to the drain pipe D by the wash water from the jet water spouting port 16. The time t11 that is the end time of the blow area is adjusted by the water discharge amount adjusting means 40a built in the controller 40, as will be described later.

  Moreover, although the water level in the water storage tank 32 is lowered by jet water discharge, it is not lowered until the water level at which the lower end float switch 32c is turned on in normal use. When the water level in the water storage tank 32 is abnormally lowered due to some trouble and the lower end float switch 32c is turned on, the controller 40 urgently stops the pressure pump 34 in order to prevent damage to the pressure pump 34. .

  Next, the controller 40 reduces the rotation speed of the pressurizing pump 34 at time t11, and the pressurizing pump 34 is stopped by time t12. Even after the jet water discharge is finished, the rim water discharge continues, and the water level in the bowl portion 12 rises accordingly. The controller 40 sends a signal to the switching valve 28 at time t13 to switch the switching valve 28 that has been switched to the rim water discharge side to the tank water supply side. The switching valve 28 is completely switched to the tank water supply side by time t <b> 14, and thereafter all the supplied wash water flows into the water storage tank 32. The post-rim cleaning time, which is the time from the time t11 when jet water discharge ends to the time t13 when a signal is sent to the switching valve 28, is adjusted by a water discharge amount adjusting means 40a built in the controller 40, as will be described later. .

  Further, the flush water flows into the water storage tank 32 to raise the water level in the water storage tank 32. At time t15, the water level rises to a predetermined water level and the upper end float switch 32b is turned on. When the upper end float switch 32b is turned on, the controller 40 sends a signal to the electromagnetic valve 22 to close it.

  On the other hand, the water discharge amount adjusting means 40a built in the controller 40 changes the time of the blow region and the rear rim cleaning time based on the flow rate of the rim water discharged measured by the sensor 30 during the front rim cleaning, as will be described later. By doing so, the jet water discharge amount discharged from the jet water discharge port 16 and the rim water discharge time discharged from the rim water discharge port 18 are adjusted. Further, after the electromagnetic valve 22 is closed, the controller 40 sends a signal to the switching valve 28 to switch the switching valve 28 that has been switched to the tank water supply side to the rim water discharge side by time t16. Thereby, one wash of the bowl part 12 is complete | finished, and it returns to a standby state.

  Next, the adjustment of the water discharge amount by the water discharge amount adjusting means 40a built in the controller 40 will be described with reference to FIG. It should be noted that the adjustment of the water discharge amount in the present embodiment is mainly performed for the purpose of preventing the cleaning water from being insufficient or from being wasted due to variations in the flow rate due to individual differences in the constant flow valve 20. Is done.

  First, in the standby state of step S0, when a toilet cleaning switch (not shown) is operated to the small cleaning side, the controller 40 outputs a small cleaning signal to the electromagnetic valve 22 or the like (step S1). The adjustment of the water discharge amount by the water discharge amount adjusting means 40a is particularly effective in the case of a small cleaning with a small total amount of discharged cleaning water. In this embodiment, the adjustment of the water discharge amount is executed only in the case of a small cleaning. Is done. When a small cleaning signal is issued from the controller 40, the front rim cleaning is started in step S2 (time t4 in FIG. 3), and the sensor 30 measures the rim water discharge flow rate during the previous rim cleaning (step S3). ). The duration of the previous rim cleaning is determined by the water discharge amount adjusting means 40a based on the previous cleaning. Subsequently, jet cleaning is executed in step S4 (time t5 in FIG. 3), and rear rim cleaning is started in step S5 (time t11 in FIG. 3).

  Here, the amount of water discharged during each cleaning is set as a default value when the constant flow valve 20 allows a flow rate as designed to pass at a normal water pressure. This default value is not changed when water is passed through inspection at the factory. Further, when the flush toilet 1 is installed at the site and the first small washing is performed by the trial operation, the washing is performed with the default value, and the flow rate of the rim water discharged in step S3 is the value at the time of the subsequent small washing. Referenced for adjustment of water discharge.

  Next, in step S6, the switching valve 28 is switched to the water storage tank 32 side (time t13 in FIG. 3). Further, in step S7, it is determined whether or not the upper end float switch 32b is turned on, and this process is repeated until it is turned on.

  When the water level of the water storage tank 32 rises and the upper end float switch 32b is turned ON, the process proceeds to step S8, where the electromagnetic valve 22 is closed (time t15 in FIG. 3). Next, in step S9, the moving average of the flow rate of the previous rim water discharge measured this time and in the past is calculated. In the present embodiment, the latest 50 flow rates including the newly measured flow rate of the previous rim water discharge are averaged. In addition, when the flow volume of the measured front rim water discharge is less than 50 times, all the past flow volume is averaged.

  Furthermore, in step S9, the water discharge amount in the next small washing is determined based on the moving average value of the flow rate of the previous rim water discharge. That is, in the present embodiment, the moving average value is classified into three stages, and any one of the three cleaning modes suitable for each case is selected. First, when the calculated moving average value is almost as designed, that is, when the constant flow valve 20 has a flow rate of about 11 to 13 liters / minute, which is almost the nominal value, the pre-rim cleaning time (see FIG. 3 between the times t4 and t5) is about 4.5 seconds, the jet water discharge blow area (between the times t10 and t11 in FIG. 3) is about 0.94 seconds, and the rear rim cleaning time (time t11 in FIG. 3). during t13) is set to about 3.2 seconds. As a result, about 0.9 liters of washing water in the front rim washing time, about 1.0 liter in the blow area, and about 0.65 liter of washing water in the rear rim washing time are discharged, respectively, and about 4 in the entire toilet bowl washing. .5 liters of wash water is used.

  When the moving average value is smaller than the design value, that is, when the constant flow valve 20 has a flow rate of less than about 11 liters / minute, which is smaller than the nominal value, the front rim cleaning time, the blow area, and the rear rim cleaning are performed. The time is set to about 4.8 seconds, about 0.99 seconds, and about 3.9 seconds, respectively. Thereby, about 0.8 liter, about 1.1 liter, and about 0.65 liter of washing water are discharged in each period, respectively, and about 4.4 liters of washing water is used in the entire toilet bowl washing.

  Further, when the moving average value is larger than the design value, that is, when the constant flow valve 20 has a flow rate of about 13 liters / minute or more, which is higher than the nominal value, the front rim cleaning time, the blow area, the rear rim cleaning are performed. The time is set to about 4.2 seconds, about 0.90 seconds, and about 2.6 seconds, respectively. Thereby, about 1.05 liters, about 1.0 liters, and about 0.65 liters of washing water are discharged in each period, respectively, and about 4.8 liters of washing water is used for the entire toilet cleaning. As described above, when the next cleaning mode is selected, the one-time process of FIG. 4 ends, and the process returns to the standby state in step S0.

  According to the flush toilet of the embodiment of the present invention, since the rim water discharge amount and the jet water discharge amount are changed, the appropriate amount of washing is always performed even when the individual difference of the constant flow valve is large while maintaining the cleaning ability of the toilet bowl. Water can be supplied.

  Further, according to the flush toilet of the present embodiment, by using the switching valve, water supply to the water storage tank is started in parallel with the rear rim cleaning, so the tank water supply time after the end of the rear rim cleaning is shortened can do. Furthermore, by appropriately setting the washing water distribution by the switching valve, it is possible to appropriately set the time until the drain trap pipe is sealed and the time when the tank water supply ends.

  In this way, by allocating the water discharge amount in the front rim cleaning, jet water discharge, and rear rim cleaning in accordance with the actual flow rate of the constant flow valve, it is possible to prevent waste of cleaning water without degrading the cleaning capacity. it can. In addition, the present inventors have found that water discharge in each period has the following actions and effects. That is, the water discharged in the front rim cleaning has the effect of dropping the filth adhering to the surface of the bowl portion into the water stored in the bowl portion, and in particular, the water washing for washing the bowl portion by the swirling flow as in this embodiment. In the toilet bowl, toilet paper and floating waste can be collected in the center of the stored water by water discharge from the front rim. Thereby, at the time of siphon action generation | occurrence | production, floating waste etc. can be discharged | emitted effectively to a drain trap pipe. Further, the water level in the bowl portion rises due to the water discharged from the front rim cleaning, the head pressure increases, and the cleaning water is pushed into the drain trap pipe, so that the siphon action can be easily activated at an early stage.

  On the other hand, water discharge in the rear rim cleaning requires a water discharge amount that can reliably seal the drain trap pipe. For this reason, when the flow rate of the constant flow valve is small, there is a possibility that the sealing water runs out unless the rear rim cleaning is made longer than the case where the constant flow valve is configured as designed. On the contrary, when the flow rate of the constant flow valve is high, waste water is generated unless the rear rim cleaning is shortened as compared with the case where the constant flow valve is configured as designed.

  The jet water spouting mainly activates the siphon action and thereby discharges the washing water and the filth in the bowl portion. The jet water spouting in the blow area (time t10 to time t11 in FIG. 3) This has the effect of dropping suspended dirt or the like that is about to return to the bowl part from the middle of the drain trap pipe over the highest part of the drain trap pipe.

  In the above-described embodiment, the rotation speed of the pressure pump in the siphon activation area (time t8 to time t9 in FIG. 3) is 3500 rpm, and 2600 rpm in the siphon duration area (time t9 to time t10 in FIG. 3). Although it was 3500 rpm in the blow region, the number of rotations and the period of each region can be appropriately changed. For example, the activation time of the siphon action can be further advanced by increasing the rotation speed of the pressure pump in the siphon activation area to about 3600 rpm. In addition, by increasing the rotation speed of the pressure pump in the blow area to about 3600 rpm, it is possible to strongly push out the floating filth and the like that is about to return to the bowl portion. It can be expected to push out filth. Alternatively, by extending the period without changing the rotation speed of the blow region, it becomes possible to more reliably extrude the floating waste and the like, and the most preferable result is obtained in the experiment by the inventors.

  Taking these actions and effects into consideration, if the flow rate of the constant flow valve is low, the post-rim cleaning time is extended to secure the cleaning water necessary for sealing, and the front rim cleaning time is also extended. As a result, it is possible to obtain a good result by collecting floating filth and the like in the center of the stored water surface and raising the stored water level so that the siphon action can be easily activated at an early stage. This is because, in particular, in small cleaning, it is more important to create a state in which dirt can be reliably discharged even with a weak siphon action than to generate a strong siphon action. Moreover, regarding jet water spouting, in addition to the above change or independently, it is effective to lengthen the time of the blow area.

  On the other hand, when the flow rate of the constant flow valve is high, the post-rim cleaning time is shortened to prevent the generation of wasted water, and a part of the cleaning water saved by this is directed to the front rim cleaning to float. Enables reliable discharge of filth. In addition, regarding jet water discharge, in addition to this change or independently, it is effective to lengthen the time of the blow area.

  Furthermore, in the above-described embodiment of the present invention, the water discharge amount adjusting means adjusts the water discharge amount based on the moving average of the flow rates of the latest 50 rim water discharges. Can also be adjusted. For example, the next water discharge amount may be determined based on the latest one-time rim water discharge flow rate. Thereby, the amount of water discharge can be adjusted corresponding to the short-term fluctuation | variation of the water supply pressure of water supply.

  Or you may adjust the amount of water discharge based on the flow volume of the newest rim water discharge, and the flow volume of the previous rim water discharge. For example, if the flow rate of the rim water discharge is ranked in about five levels, and the difference between the flow rate of the latest rim water discharge and the flow rate of the previous rim water discharge is within two levels, the flow rate of the latest rim water discharge The amount of water discharge based on is used for the next cleaning. When the gap is larger than two stages, the water discharge amount based on the rank in which the rank of the flow rate of the previous rim water discharge is close to the flow rank of the latest rim water discharge is used for the next cleaning. Thereby, the balance of the quick response of water discharge amount and stability can be taken.

  As mentioned above, although preferable embodiment of this invention was described, a various change can be added to embodiment mentioned above. In particular, in the above-described embodiment, the water discharge amount or the water discharge time determined based on the latest rim water discharge flow rate was used in the next toilet flushing. Can also be reflected.

  As such a modification, when the flow rate of the rim water discharged detected in the latest toilet flushing is less than the flow rate of the previous rim water discharge, after the water storage tank is returned to the specified water storage amount, it is added The controller may be configured to discharge water and raise the water level in the bowl portion. In other words, when the flow rate of the previous rim water discharge in the latest toilet flushing is significantly smaller than the previous flow rate of the previous rim water discharge, the flow rate is significantly lower than the previous time, and the post-rim cleaning has a higher flow rate. It was performed only for the rim water discharge time determined based on the previous toilet flushing. For this reason, in the worst case, the amount of cleaning water by the rear rim cleaning is insufficient, and the drain trap pipe cannot be sealed. Therefore, the controller raises the water level in the bowl portion by performing additional water discharge so that such a shortage of washing water does not occur.

  According to this modified example configured as described above, it is possible to prevent the sealing water from running out even when the tap water pressure is suddenly lowered, such as when the tap water is used in the bathroom or the like during the toilet cleaning. .

  Further, in this modification, first, the washing water supplied to the bowl portion from the flow rate of the latest rim water discharge and the time of the subsequent rim washing (latest rim watering time) determined based on the toilet flushing until the previous time. The amount of is calculated. Next, the lack of wash water is calculated from the calculated amount of wash water and the amount of wash water stored in advance necessary for sealing the drain trap pipe. It is supplied to the bowl as additional water discharge.

  According to this modified example configured as described above, the drain trap pipe can be reliably sealed, and generation of wasted water due to an excessive amount of additional water discharge can be prevented.

  Alternatively, as in the above-described embodiment, when the water discharge flow rate is divided into several stages and the post-rim cleaning time is set for each rank, the latest rim water discharge flow rate and the previous rim water discharge flow rate are set. The amount of additional water discharge may be set in advance according to the number of ranks of the gaps, or a sufficient amount may be set in advance regardless of the shortage of cleaning water.

  Further, the additional water discharge may be performed via the rim water discharge port by appropriately opening or switching the electromagnetic valve and the switching valve, or may be performed via the jet water discharge port by operating the pressure pump at a low speed. Also good.

  Alternatively, the additional water discharge can be performed via an overflow channel (not shown) extending from the inside of the water storage tank. The overflow channel is configured to discharge the wash water in the water storage tank to the bowl portion when the water level in the water storage tank exceeds a predetermined water level and prevent the wash water from overflowing from the water storage tank. This overflow channel can be configured to communicate with the bowl portion via a rim water spouting port or a jet water spouting port. Alternatively, the overflow channel can be configured to communicate with the bowl portion through an opening provided separately from the rim water spouting port and the jet water spouting port.

  In the case of performing additional water discharge through the overflow channel, the controller continues to supply water to the water storage tank even after the float switch detects that the water is full, and overflows a necessary amount of washing water to the bowl portion.

It is the perspective view which looked at the flush toilet by embodiment of this invention from back right diagonally. It is a block diagram which shows the rim water discharge and the water supply system of jet water discharge. It is a graph which shows the timing which each part act | operates at the time of washing of a flush toilet. It is a flowchart which shows the adjustment procedure of the amount of water discharge.

Explanation of symbols

D Drain pipe 1 Flush toilet according to the first embodiment of the present invention 2 Flush toilet main body 2a Mounting frame 2b Water receiving tray 10 Functional part 12 Bowl part 14 Drain trap pipe 16 Jet water outlet 16a Jet side water supply path 18 Rim discharge Water outlet 18a Rim side water supply path 19 Pipe line 20 Constant flow valve 22 Solenoid valve 24 Rim water discharge vacuum breaker 26 Rim water discharge flapper valve 28 Switching valve 30 Sensor 32 Water storage tank 32a Tank water supply path 32b Upper end float switch 32c Lower end float switch 32d Metal Plate 34 Pressurizing pump 34a Washing water conduit 36 Jet water discharge vacuum breaker 38 Jet water discharge flapper valve 40 Controller 40a Water discharge amount adjusting means 42a Stop cock 42b Branch fitting 42c Strainer

Claims (9)

A flush toilet flushed with pressurized flush water,
A bowl portion in which a rim spout and a jet spout are formed, and a flush toilet body provided with a drain trap conduit;
A pressurizing pump for pressurizing wash water discharged from the jet water spouting port;
A water storage tank for storing cleaning water to be pressurized by the pressure pump;
The rim cleaning is performed by discharging cleaning water from the rim spout by the water supply pressure, and the jet cleaning is performed by discharging the cleaning water in the water storage tank from the jet spout by the pressure pump. Cleaning control means for cleaning;
A flow rate measuring means provided in a water supply path for cleaning water discharged from the rim water spouting port, and measuring a flow rate of the cleaning water discharged from the rim water spouting port during the rim cleaning;
And a water discharge amount adjusting means for adjusting the water discharge time of the rim cleaning performed by the cleaning control means and the water discharge amount of the jet cleaning based on the flow rate measured by the flow rate measuring means. The means adjusts the water discharge amount of the jet cleaning by changing the rotation speed of the pressurizing pump ,
In the jet cleaning, a siphon activation area that activates the siphon action, a siphon duration area that has a lower flow rate than the siphon activation area and maintains the activated siphon action, and after the siphon action ends, the filth in the drain trap pipe is removed. A flush toilet comprising a blow area to be pushed out, wherein the washing control means operates the pressure pump at a rotational speed substantially equal to the siphon activation area . The water spouting volume adjustment means, in addition to varying the rotation speed of the pressure pump, the by varying the time for operating the pressure pump also, according to claim 1 wherein adjusting the water discharge amount of the jet cleaning Flush toilet. The flush toilet according to claim 1 or 2 , wherein the water discharge amount adjusting means adjusts the water discharge amount of the jet cleaning by changing the time of the blow region. The water spouting volume adjustment means, based on the measured flow rate by the flow rate measuring means, any of claims 1 to 3 to adjust the water spouting volume of the water discharge time and the jet cleaning of the rim flush in the cleaning of the next bowl portion The flush toilet according to claim 1. The cleaning control means is configured to perform rim cleaning over a water discharge time adjusted based on a flow rate of rim water discharged at the time of previous toilet cleaning, and the rim water discharge measured in the latest toilet cleaning When the flow rate of the water is less than the flow rate of the previous rim water discharge, after the water storage tank is returned to a specified water storage amount, additional water discharge is performed to raise the water level in the bowl portion. The flush toilet according to any one of 1 to 4 . The amount of cleaning water supplied to the bowl portion by the additional water discharge is determined based on the flow rate of the latest rim water discharge and the water discharge time of the latest rim cleaning so that the drain trap pipe is sealed. 6. The flush toilet according to claim 5, which is determined by the control means. The rim cleaning includes a pre-rim cleaning that is started before the start of the jet cleaning and a post-rim cleaning that is performed after the completion of the jet cleaning. The flush toilet of any one of Claims 1 thru | or 6 which measures this. The water spouting volume adjustment means, claim adjusting based on the flow rate of the washing water measured during the pre rim flush, water spouting time of the water discharge amount and the post rim flush of the jet cleaning initiated immediately thereafter 7 A flush toilet according to 1. The flush toilet according to any one of claims 1 to 8 , wherein the flow rate measuring means is a pressure sensor.

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